Answer in brief
CVE-2026-64402 records a Unknown severity vulnerability in coresight: ultrasoc-smb: Fix OOB write in smb_sync_perf_buffer(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=06f5c2926aaa0fba7f99678da6ef77cbbbda1441 <38dbc8db8341ccdf8e1e1a067453d33ad751864b || >=06f5c2926aaa0fba7f99678da6ef77cbbbda1441 <4c5a0a946373da99a80398289b28845b5ae40cd1 || >=06f5c2926aaa0fba7f99678da6ef77cbbbda1441 <661a019ac0413ecec9e5d1dfcc12fbca8e78d5fb || >=06f5c2926aaa0fba7f99678da6ef77cbbbda1441 <daf6246ab988fc8bdc82ad7c8d0b1c182d11b15f || >=06f5c2926aaa0fba7f99678da6ef77cbbbda1441 <98495b5a4d77dd22e106f462b76e1093a55b29a7 | 38dbc8db8341ccdf8e1e1a067453d33ad751864b, 4c5a0a946373da99a80398289b28845b5ae40cd1, 661a019ac0413ecec9e5d1dfcc12fbca8e78d5fb, daf6246ab988fc8bdc82ad7c8d0b1c182d11b15f, 98495b5a4d77dd22e106f462b76e1093a55b29a7 |
| Linux/Linuxgeneric | 6.3 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: coresight: ultrasoc-smb: Fix OOB write in smb_sync_perf_buffer() When the SMB sink is used as a perf AUX sink, smb_update_buffer() calls smb_sync_perf_buffer() to copy hardware trace data into the perf AUX ring buffer pages. It derives pg_idx = head >> PAGE_SHIFT from @head, which is handle->head, and indexes dst_pages[pg_idx]. The pg_idx %= nr_pages normalization is only applied after the first loop iteration. This leaves the initial page index underived from the buffer size, which can result in an out-of-bounds write past dst_pages[] when head exceeds the AUX buffer size. Normalize head modulo the AUX buffer size before deriving the page index and offset, mirroring tmc_etr_sync_perf_buffer().
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64402 records a Unknown severity vulnerability in coresight: ultrasoc-smb: Fix OOB write in smb_sync_perf_buffer(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=06f5c2926aaa0fba7f99678da6ef77cbbbda1441 <38dbc8db8341ccdf8e1e1a067453d33ad751864b || >=06f5c2926aaa0fba7f99678da6ef77cbbbda1441 <4c5a0a946373da99a80398289b28845b5ae40cd1 || >=06f5c2926aaa0fba7f99678da6ef77cbbbda1441 <661a019ac0413ecec9e5d1dfcc12fbca8e78d5fb || >=06f5c2926aaa0fba7f99678da6ef77cbbbda1441 <daf6246ab988fc8bdc82ad7c8d0b1c182d11b15f || >=06f5c2926aaa0fba7f99678da6ef77cbbbda1441 <98495b5a4d77dd22e106f462b76e1093a55b29a7 | 38dbc8db8341ccdf8e1e1a067453d33ad751864b, 4c5a0a946373da99a80398289b28845b5ae40cd1, 661a019ac0413ecec9e5d1dfcc12fbca8e78d5fb, daf6246ab988fc8bdc82ad7c8d0b1c182d11b15f, 98495b5a4d77dd22e106f462b76e1093a55b29a7 |
| Linux/Linuxgeneric | 6.3 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: coresight: ultrasoc-smb: Fix OOB write in smb_sync_perf_buffer() When the SMB sink is used as a perf AUX sink, smb_update_buffer() calls smb_sync_perf_buffer() to copy hardware trace data into the perf AUX ring buffer pages. It derives pg_idx = head >> PAGE_SHIFT from @head, which is handle->head, and indexes dst_pages[pg_idx]. The pg_idx %= nr_pages normalization is only applied after the first loop iteration. This leaves the initial page index underived from the buffer size, which can result in an out-of-bounds write past dst_pages[] when head exceeds the AUX buffer size. Normalize head modulo the AUX buffer size before deriving the page index and offset, mirroring tmc_etr_sync_perf_buffer().
Quoted source text, attributed separately from HOL analysis.